Diaphragm pump



FIG. 1 is a front view of a diaphragm pump showing our new design;

FIG. 2 is a back view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top perspective view; and,

FIG. 8 is a bottom perspective view.

The broken lines are included for the purpose of illustrating portions of the diaphragm pump that form no part of the claimed design. 

CLAIM The ornamental design for a diaphragm pump, as shown and described. 